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确立了粮谷和油籽中氯苯胺灵残留量的气相色谱测定方法,试样采用甲醇提取,经与正己烷液液分配,再以弗罗里硅土柱净化,毛细管柱气相色谱-氮磷检测器测定。方法简便、准确、检出限0.02μg/g,添加回收率为87.5-92.9%,相对标准偏差为3.5-7.0%。 相似文献
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The application of the matrix solid-phase dispersion (MSPD) process as sample treatment in connection with the electrochemical detection is studied for the first time. For this purpose, a novel methodology is introduced for the extraction of propham and maleic hydrazide herbicides from potatoes samples based in the MSPD process prior to their electrochemical detection. Potato samples disruption was done by blending them with C8 bonded-phase and selective herbicide extraction was achieved by successive treatment of the blended with 50 mM phosphate buffer pH 7.4 (for maleic hydrazide) and methanol (for propham). The extraction procedure efficiency was estimated using differential pulse voltammetry in potato samples spiked with the herbicides yielding recovery values of 98% and 68% for propham and maleic hydrazide, respectively. No significant adverse effect of the MSPD process was observed on the herbicides electrochemical signals. For comparison, recovery studies using HPLC with UV detection were carried out and a good correlation in the results obtained by using both techniques was observed. 相似文献
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